[논문]대기의 강이 한반도 지역별 강수에 미치는 영향

권예은; 박찬일; 백승윤; 손석우; 김진원; 차은정

doi:10.14191/atmos.2022.32.2.135

[국내논문] 대기의 강이 한반도 지역별 강수에 미치는 영향
Influence of Atmospheric Rivers on Regional Precipitation in South Korea 원문보기

대기 = Atmosphere, v.32 no.2, 2022년, pp.135 - 148

권예은 (서울대학교 자연과학대학 지구환경과학부) , 박찬일 (서울대학교 자연과학대학 지구환경과학부) , 백승윤 (서울대학교 자연과학대학 지구환경과학부) , 손석우 (서울대학교 자연과학대학 지구환경과학부) , 김진원 (국립기상과학원 기후변화예측연구팀) , 차은정 (국립기상과학원 예보연구부)

Abstract ▼ AI-Helper

This study investigates the influence of atmospheric river (AR) on precipitation over South Korea with a focus on regional characteristics. The 42-year-long catalog of ARs, which is obtained by applying the automatic AR detection algorithm to ERA5 reanalysis data and the insitu precipitation data recorded at 56 weather stations across the country are used to quantify their relationship. Approximately 51% of the climatological annual precipitation is associated with AR. The AR-related precipitation is most pronounced in summer by approximately 58%, while only limited fraction of precipitation (26%) is AR-related in winter. The heavy precipitation (> 30 mm day-1) is more prone to AR activity (59%) than weak precipitation (5~30 mm day-1; 33%) in all seasons. By grouping weather stations into the four sub-regions based on orography, it is found that the contribution of AR precipitation to the total is largest in the southern coast (57%) and smallest in the eastern coast (36%). Similar regional variations in AR precipitation fractions also occur in weak precipitation events. The regional contrast between the northern and southern stations is related to the seasonal variation of AR-frequency. In addition, the regional contrast between the western and eastern stations is partly modulated by the orographic forcing. The fractional contribution of AR to heavy precipitation exceeds 50% in all seasons, but this is true only in summer along the eastern coast. This result indicates that ARs play a critical role in heavy precipitation in South Korea, thus routine monitoring of ARs is needed for improving operational hydrometeorological forecasting.

주제어

표/그림 (10)

그림 Fig. 1. Flowchart of the AR detection procedure.
그림 Fig. 2. Examples of East Asian ARs on (a) 0000 UTC February 13, 2009, (b) 1200 UTC February 13, 2009, (c) 0000 UTC February 14, 2009, (d) 0600 UTC August 15, 2020, (e) 1800 UTC August 15, 2020, and (f) 0600 UTC August 16, 2020. The illustrations show the 850-hPa geopotential height (gpm, contoured), IVTA (kg m^-1 s^-1, shaded), and ARs (thick orange lines).
그림 Fig. 3. Monthly climatology of AR frequency (%, shaded) and 850-hPa geopotential height (gpm, contoured) in East Asia. The red boxed region in (a) is the South Korea domain in this study (33~39°N, 124.5~130.5°E).
그림 Fig. 4. The AR frequency (%) in 10-day bins in South Korea (red boxed region; 33~39°N, 124.5~130.5°E).
그림 Fig. 5. The 10-day bins of (a) total precipitation (mm day1, green) and AR precipitation (mm day^-1, blue), (b) number of days of the total weak (5~30 mm day^-1) precipitation (blue) and AR weak precipitation (green), and (c) number of days of the total heavy (> 30 mm day^-1) precipitation (blue) and AR heavy precipitation (green) in South Korea (33~39°N, 124.5~130.5°E). The thick black line indicates (a) the ratio of AR precipitation to total precipitation, (b) the ratio of AR weak precipitation events to total weak precipitation events, and (c) the ratio of AR heavy precipitation events to total heavy precipitation events, respectively. Due to the sample size issue, the ratio of AR heavy precipitation events to total heavy precipitation events in DJF is not displayed.
그림 Fig. 6. Regional classification of the study area.
그림 Fig. 7. The 10-day bins of the regional climatology of precipitation (mm day^-1, green) and AR precipitation (mm day^-1, blue). The thick black line indicates the ratio of AR precipitation to total precipitation.
그림 Fig. 8. Similar to Fig. 7, but for the number of days of the weak (5~30 mm day^-1) precipitation.
그림 Fig. 9. Similar to Fig. 8, but for the number of days of the heavy (> 30 mm day^-1) precipitation. Due to the sample size issue, the ratio of AR heavy precipitation events to total heavy precipitation events in DJF is not displayed.
표 Table 1. Seasonal-mean, regional-mean AR precipitation trends (mm decade^-1) for the period of 1979~2020. Values that are statistically significant at the 95% confidence level are denoted with an asterisk.

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